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Authorities are applauding a cab driver for helping two Riverside police officers who were shot by Christopher Dorner in an ambush.

Karam Kaoud stopped his taxi at a red light when a gunman pulled up next to a police car and opened fire on Feb. 7, killing Michael Crain and wounding Andrew Tachias.

Kaoud tells the Riverside Press-Enterprise he ran to the police car after the gunman believed to be Dorner sped off. He said Crain was unconscious and Tachias couldn't move, so the officer asked him to push the radio button so he could call for help.

An ambulance rushed to the scene and took Tachias to the hospital.

Police Chief Sergio Diaz says that any delay in getting help could have been detrimental for Tachias.